Device for preventing doubles in spinning machines



Sept 17, 1929. WEBER 1,728,707

DEVICE FOR PREVENTING DOUBLES IN SPINNING MACNINES Fil e d Oct. 27. 1927I: P :2! 3 n II:

2. 9L. HI 1 Y W 21% i r 3 Mk6?!)- Patented Sept. 17, 1929 UNITED STATESMAX WEBER, or EUPEN, BELGIUM DEVICE FOR PREVENTING DOUBLES IN SPINNINGMACHINES Application filed October 27, 1927, Serial No.

There have already been proposed various devices for preventing theformation of doubles in spinning and twisting machines. These knowndevices consist either of fixed sheet metal plates arranged between thethreads and provided with catching slots or of swinging or revolvinghooks. While comparatively good results may be obtained with the saidslotted fixed plates, same possess the 1 serious drawback that, in orderto render them effective throughout the entire length on which thespinning or-twisting of the yarn takes place, they have to be made of alength corresponding to the distance between the drawing rollers and thebobbins or spindles. Stationary plates of such a length form largesurfaces on which spinning fly and dust may easily deposit andaccumulate. In case a draught of air passes through the machine orbroken threads impinge on the plates, the fly and dust thereon will comeinto contact with and contaminate the threads. Besides the survey of thetotality of threads is greatly impaired by the said plates because theyare stationary and of large dimensions. The known swinging or revolvinghooks have the disadvantage that they are only operative on a definiteportion of the space between the drawing rollers and bobbins, namelybetween the front drawing roller and the thread guide or between thelatter and the bobbins. These hooks therefore cannot prevent theformation of doubles on the other portion of the said space. Moreover,the action of these swinging or revolving hooks is rather imperfect inas much as they are not of such a shape as to allow them to seize andhold broken ends immediately. They act only by pressure on one of twoends which are already twisting in with each other and cause a breakingdown of the doubles by the ten-- sion to which the ends are thussubjected. Now, worsted yarn is for instance very elastic and a worstedend seized by such a swinging hook would be several times taken along bythe same up and down and therefore go on for some time twisting in withan adjacent end before it breaks under the tension.

The known swinging hooks are therefore en- 229,237, and in GermanyNovember 30,1926.

tirely unsuitable for use on worsted spinning machines. l i

The present invention has for its object to provide a device forpreventing the formation of doubles in spinning machineswhich does notpossess the drawbacks of the known devices. The device, consistslikewise of sheet metal plates provided with incisions forcatchingthebroken ends and arranged betweenthe threads. According to theinvention, these plates are mounted substantially in the middle betweenthe front drawing roller and thetop ends of the bobbins for verticalswinging motion so that, in operation, they will move throughout theentire height of the space between the front draw ing roller and thebobbins. These oscillatory plates will securely prevent any formation ofdoubles both above and below the thread guides. As the plates aremounted for swinging motion at the centre of the distance through whichthethreads being spun pass, they need only have half the length of theknown stationary plates. The surface of the plates on'which spinning flyand dust may deposit is therefore essentially reduced. Be-, sides, anaccumulation of fly and dust cannot occur at all becauseof the constantup and, down movement of theplates. The swinging plates also do notinterfere with the surve v of the totality. of threads in an appreciabledegree, since the whole row of threads is fully open to inspectionalternately below andabove theaxis of rotation of the plates accordingto whether the plates are at the upper or lower end of their stroke.

The new device is more particularly adapted for use inworstedringspinning machines.

An embodiment of the subject-matter of the invention isillustrated, byway of example,in the accompanying drawing, in which:

Fig.1 is a diagrammatic cross-section of a portionof a ringspinningmachinewith 'the device according to the invention appliedthereto, c

Fig, 2 is a, diagrammatic front elevation'of" some threads with platesto prevent doubles arranged between the threads.

The drawing only shows those parts of a, ring spinning machine which arenecessary drawing roller and the tope'nds oftliebobbins Z). This shaft 9is designed to have par- 7 tial rotations in opposite *dire ctionsimparted to it by any suitable means well-known in the art. Owing to'these rocking motions of the shaft 9 the plates (Z are'alternatelymovedup anddown on the path A B so that they R will securely catch brokenends or break down doubles which are being formed.

In operation, the plates "(Zswing up and down clear of the threads F.If'an end of yarn breaks, this' broken end is either immediately caughtby one 'of'the adjacent swinging plates "(l and thus prevented fromcoming intocont-act with' anotherend, or if it reaches one of theadyacent ends'an'd commences to twist in with the same it willVe'n" themore securely be seized 'by'the' swinging plates; be-

7 cause the broken end then extends transverse- 'ly of the path'ofm'ovement of the plates. In

I the latter case the formation ofdou'bles' will 'therefore be stoppedalready at the beginning. In this case, especially in the formation ofdoublesabove the guide wires ofrin'g spinning machines, the plates donot only seize the broken en'd'but they alsoseize and I break down theend with which the broken by in with the same.

oneis twisting in. This has the advantage allowing the spinner whenpiecing-up the ends to make out the short piece of double formed andremove it. I V

Fig. 2 illustrates how a broken'end of yarn has flown to an adjacent endand is twisting It will be understood that in the upward movement of theplate (Z lying below the transversely extending brokenend this platewill catch thefd ouble information in one ofits incisions and break itdown.

Having thus described my invention, what I claim as new and desire tosecure by "Letter s Patent is I v In combination with aspinning'm'achine,

meansfor preventing the formation of doubles comprising a horizontalrock shaft arranged substantially in the middle between the frontdrawing roller and the top ends of the bob-bins, sheetmetalplates withslotted edges fastened on the said shaft so as to extend between thethreads parallelthereof and adapted to-beswung up and down bythe shaft,these plates being'of'such a shape and size that when operated they willmove from end to end of the space between the front drawing roller andthe bobbins.

In testimony whereof I have signed my name to this specification.

MAX WEBER.

